Please allow me to state first – I am sorry to ask these questions, but all of my searches did not give me the answers I was looking for.

My questions are
How much louder will the Evolution exhaust be with the GT4 X-pipe? Assuming the OP has the X-pipe with the two 100psi cats and the resonators.
Would the evolution exhaust be too loud with the GT4 X-pipe (no cats and no resonators), meaning noise levels like the Eisenmann Race, RPI, Kreissieg with valves open, etc…?

I have found video clips of the GT4 x-pipe paired with other mufflers, but not with the Akra mufflers.
I am also considering to take the cold start out for the cat less setup.